Psalm 103
Psalm 103:1–22 is a song that testifies to the Lord’s mercy; he does not treat us as our sins deserve. This will be a good song to sing before your sermon, perhaps a song of praise at the beginning of the worship service.
Psalm 139
Psalm 139:1–24 is a song which testifies to God’s presence. He sees everything and is in complete control of history. This would be a good song to sing after your sermon, especially Psalm 139:1–12.
1 There was a man of Benjamin whose name was Kish, the son of Abiel, son of Zeror, son of Becorath, son of Aphiah, a Benjaminite, a man of wealth.